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2744 lines (2554 loc) · 72 KB
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/*
* Copyright 2015 Steven Watanabe
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE.txt or copy at
* https://www.bfgroup.xyz/b2/LICENSE.txt)
*/
#include "jam.h"
#include "debugger.h"
#include "constants.h"
#include "cwd.h"
#include "function.h"
#include "frames.h"
#include "mem.h"
#include "object.h"
#include "parse.h"
#include "pathsys.h"
#include "startup.h"
#include "jam_strings.h"
#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <signal.h>
#include <ctype.h>
#ifdef NT
#include <windows.h>
#include <io.h>
#include <fcntl.h>
#else
#include <errno.h>
#include <sys/wait.h>
#include <unistd.h>
#endif
#include <string>
#include <vector>
#undef debug_on_enter_function
#undef debug_on_exit_function
struct breakpoint
{
OBJECT * file;
OBJECT * bound_file;
int line;
int status;
};
#define BREAKPOINT_ENABLED 1
#define BREAKPOINT_DISABLED 2
#define BREAKPOINT_DELETED 3
static struct breakpoint * breakpoints;
static int num_breakpoints;
static int breakpoints_capacity;
#define DEBUG_NO_CHILD 0
#define DEBUG_RUN 1
#define DEBUG_STEP 2
#define DEBUG_NEXT 3
#define DEBUG_FINISH 4
#define DEBUG_STOPPED 5
#define DEBUG_MSG_BREAKPOINT 1
#define DEBUG_MSG_END_STEPPING 2
#define DEBUG_MSG_SETUP 3
#define DEBUG_MSG_DONE 32
static int debug_state;
static int debug_depth;
static OBJECT * debug_file;
static int debug_line;
static FRAME * debug_frame;
b2::list_ref debug_print_result;
static int current_token;
static int debug_selected_frame_number;
/* Commands are read from this stream. */
static FILE * command_input;
/* Where to send output from commands. */
static FILE * command_output;
/* Only valid in the parent. Reads command output from the child. */
static FILE * command_child;
struct command_elem
{
const char * key;
void (*command)( int, const char * * );
};
static struct command_elem * command_array;
static void debug_listen( void );
static int read_command( void );
static int is_same_file( OBJECT * file1, OBJECT * file2 );
static void debug_mi_format_token( void );
static OBJECT * make_absolute_path( OBJECT * filename );
static void debug_string_write( FILE * out, const char * data )
{
fprintf( out, "%s", data );
fputc( '\0', out );
}
static std::string debug_string_read( FILE * in )
{
string buf[ 1 ];
int ch;
std::string result;
string_new( buf );
while( ( ch = fgetc( in ) ) > 0 )
{
string_push_back( buf, (char)ch );
}
result = buf->value;
string_free( buf );
return result;
}
static void debug_object_write( FILE * out, OBJECT * data )
{
debug_string_write( out, object_str( data ) );
}
static OBJECT * debug_object_read( FILE * in )
{
string buf[ 1 ];
int ch;
OBJECT * result;
string_new( buf );
while( ( ch = fgetc( in ) ) > 0 )
{
string_push_back( buf, (char)ch );
}
result = object_new( buf->value );
string_free( buf );
return result;
}
static void debug_int_write( FILE * out, int i )
{
fprintf( out, "%d", i );
fputc( '\0', out );
}
static int debug_int_read( FILE * in )
{
OBJECT * str = debug_object_read( in );
int result = atoi( object_str( str ) );
object_free( str );
return result;
}
static void debug_list_write( FILE * out, LIST * l )
{
LISTITER iter = list_begin( l ), end = list_end( l );
fprintf( out, "%d\n", list_length( l ) );
for ( ; iter != end; iter = list_next( iter ) )
{
debug_object_write( out, list_item( iter ) );
}
}
static LIST * debug_list_read( FILE * in )
{
int len;
int i;
LIST * result = L0;
int ret = fscanf( in, "%d", &len );
if (ret == 1)
{
int ch = fgetc( in );
if (ch > 0) assert( ch == '\n' );
for ( i = 0; i < len; ++i )
{
result = list_push_back( result, debug_object_read( in ) );
}
}
return result;
}
static void debug_lol_write( FILE * out, LOL * lol )
{
int i;
debug_int_write( out, lol->count );
for ( i = 0; i < lol->count; ++i )
{
debug_list_write( out, lol_get( lol, i ) );
}
}
static void debug_lol_read( FILE * in, LOL * lol )
{
int count, i;
lol_init( lol );
count = debug_int_read( in );
for ( i = 0; i < count; ++i )
{
lol_add( lol, debug_list_read( in ) );
}
}
static void debug_format_rulename ( string * out, FRAME * frame )
{
const char * pos = strchr( frame->rulename, '.' );
if ( frame->module->class_module && pos )
{
string_copy( out, object_str( frame->module->name ) );
string_push_back( out, '.' );
string_append( out, pos + 1 );
}
else
{
string_copy( out, frame->rulename );
}
}
static void debug_frame_write( FILE * out, FRAME * frame )
{
string rulename_buffer [ 1 ];
OBJECT * fullname = constant_builtin;
OBJECT * file = frame->file;
if ( file == NULL ) file = constant_builtin;
else fullname = make_absolute_path( frame->file );
debug_format_rulename( rulename_buffer, frame );
debug_object_write( out, file );
debug_int_write( out, frame->line );
debug_object_write( out, fullname );
debug_lol_write( out, frame->args );
debug_string_write( out, rulename_buffer->value );
object_free( fullname );
string_free( rulename_buffer );
}
/*
* The information passed to the debugger for
* a frame is slightly different from the FRAME
* struct.
*/
typedef struct _frame_info
{
OBJECT * file = nullptr;
int line = 0;
OBJECT * fullname = nullptr;
LOL args[ 1 ];
std::string rulename;
_frame_info()
{
lol_init( args );
}
~_frame_info()
{
if ( file ) object_free( file );
if ( fullname ) object_free( fullname );
lol_free( args );
}
} FRAME_INFO;
static void debug_frame_read( FILE * in, FRAME_INFO * frame )
{
frame->file = debug_object_read( in );
frame->line = debug_int_read( in );
frame->fullname = debug_object_read( in );
debug_lol_read( in, frame->args );
frame->rulename = debug_string_read( in );
}
static int add_breakpoint( struct breakpoint elem )
{
if ( num_breakpoints == breakpoints_capacity )
{
int new_capacity = breakpoints_capacity * 2;
if ( new_capacity == 0 ) new_capacity = 1;
breakpoints = ( struct breakpoint * )realloc( breakpoints, new_capacity * sizeof( struct breakpoint ) );
breakpoints_capacity = new_capacity;
}
breakpoints[ num_breakpoints++ ] = elem;
return num_breakpoints;
}
static int add_line_breakpoint( OBJECT * file, int line )
{
struct breakpoint elem;
elem.file = file;
elem.bound_file = NULL;
elem.line = line;
elem.status = BREAKPOINT_ENABLED;
return add_breakpoint( elem );
}
static int add_function_breakpoint( OBJECT * name )
{
struct breakpoint elem;
elem.file = name;
elem.bound_file = object_copy( name );
elem.line = -1;
elem.status = BREAKPOINT_ENABLED;
return add_breakpoint( elem );
}
/*
* Checks whether there is an active breakpoint at the
* specified location. Returns the breakpoint id
* or -1 if none is found.
*/
static int handle_line_breakpoint( OBJECT * file, int line )
{
int i;
if ( file == NULL ) return 0;
for ( i = 0; i < num_breakpoints; ++i )
{
if ( breakpoints[ i ].bound_file == NULL && is_same_file( breakpoints[ i ].file, file ) )
{
breakpoints[ i ].bound_file = object_copy( file );
}
if ( breakpoints[ i ].status == BREAKPOINT_ENABLED &&
breakpoints[ i ].bound_file != NULL &&
object_equal( breakpoints[ i ].bound_file, file ) &&
breakpoints[ i ].line == line )
{
return i + 1;
}
}
return 0;
}
static int handle_function_breakpoint( OBJECT * name )
{
return handle_line_breakpoint( name, -1 );
}
static OBJECT * make_absolute_path( OBJECT * filename )
{
PATHNAME path1[ 1 ];
string buf[ 1 ];
OBJECT * result;
const char * root = object_str( cwd() );
path_parse( object_str( filename ), path1 );
path1->f_root.ptr = root;
path1->f_root.len = int32_t(strlen( root ));
string_new( buf );
path_build( path1, buf );
result = object_new( buf->value );
string_free( buf );
return result;
}
static OBJECT * get_filename( OBJECT * path )
{
PATHNAME path1[ 1 ];
string buf[ 1 ];
OBJECT * result;
path_parse( object_str( path ), path1 );
path1->f_dir.ptr = NULL;
path1->f_dir.len = 0;
string_new( buf );
path_build( path1, buf );
result = object_new( buf->value );
string_free( buf );
return result;
}
static int is_same_file( OBJECT * file1, OBJECT * file2 )
{
OBJECT * absolute1 = make_absolute_path( file1 );
OBJECT * absolute2 = make_absolute_path( file2 );
OBJECT * norm1 = path_as_key( absolute1 );
OBJECT * norm2 = path_as_key( absolute2 );
OBJECT * base1 = get_filename( file1 );
OBJECT * base2 = get_filename( file2 );
OBJECT * normbase1 = path_as_key( base1 );
OBJECT * normbase2 = path_as_key( base2 );
int result = object_equal( norm1, norm2 ) ||
( object_equal( base1, file1 ) && object_equal( normbase1, normbase2 ) );
object_free( absolute1 );
object_free( absolute2 );
object_free( norm1 );
object_free( norm2 );
object_free( base1 );
object_free( base2 );
object_free( normbase1 );
object_free( normbase2 );
return result;
}
static void debug_print_source( OBJECT * filename, int line )
{
FILE * file;
if ( filename == NULL || object_equal( filename, constant_builtin ) )
return;
file = fopen( object_str( filename ), "r" );
if ( file )
{
int ch;
int printing = 0;
int current_line = 1;
if ( line == 1 )
{
printing = 1;
printf( "%d\t", current_line );
}
while ( ( ch = fgetc( file ) ) != EOF )
{
if ( printing )
fputc( ch, stdout );
if ( ch == '\n' )
{
if ( printing )
break;
++current_line;
if ( current_line == line )
{
printing = 1;
printf( "%d\t", current_line );
}
}
}
fclose( file );
}
}
static void debug_print_frame_info( FRAME_INFO & frame )
{
OBJECT * file = frame.file;
if ( file == NULL ) file = constant_builtin;
printf( "%s ", frame.rulename.c_str() );
if ( frame.rulename != "module scope" )
{
printf( "( " );
if ( frame.args->count )
{
lol_print( frame.args );
printf( " " );
}
printf( ") " );
}
printf( "at %s:%d", object_str( file ), frame.line );
}
static void debug_mi_print_frame_info( FRAME_INFO * frame )
{
printf( "frame={func=\"%s\",args=[],file=\"%s\",fullname=\"%s\",line=\"%d\"}",
frame->rulename.c_str(),
object_str( frame->file ),
object_str( frame->fullname ),
frame->line );
}
static void debug_on_breakpoint( int id )
{
fputc( DEBUG_MSG_BREAKPOINT, command_output );
debug_int_write( command_output, id );
fflush( command_output );
debug_listen();
}
static void debug_end_stepping( void )
{
fputc( DEBUG_MSG_END_STEPPING, command_output );
fflush( command_output );
debug_listen();
}
void debug_on_instruction( FRAME * frame, OBJECT * file, int line )
{
int breakpoint_id;
assert( debug_is_debugging() );
if ( debug_state == DEBUG_NEXT &&
( debug_depth < 0 || ( debug_depth == 0 && debug_line != line ) ) )
{
debug_file = file;
debug_line = line;
debug_frame = frame;
debug_end_stepping();
}
else if ( debug_state == DEBUG_STEP && debug_line != line )
{
debug_file = file;
debug_line = line;
debug_frame = frame;
debug_end_stepping();
}
else if ( debug_state == DEBUG_FINISH && debug_depth < 0 )
{
debug_file = file;
debug_line = line;
debug_frame = frame;
debug_end_stepping();
}
else if ( ( debug_file == NULL || ! object_equal( file, debug_file ) ||
line != debug_line || debug_depth != 0 ) &&
( breakpoint_id = handle_line_breakpoint( file, line ) ) )
{
debug_file = file;
debug_line = line;
debug_frame = frame;
debug_on_breakpoint( breakpoint_id );
}
else if ( ( debug_state == DEBUG_RUN || debug_state == DEBUG_FINISH ) &&
( debug_depth < 0 || ( debug_depth == 0 && debug_line != line ) ) )
{
debug_file = NULL;
debug_line = 0;
}
}
void debug_on_enter_function( FRAME * frame, OBJECT * name, OBJECT * file, int line )
{
int breakpoint_id;
assert( debug_is_debugging() );
++debug_depth;
if ( debug_state == DEBUG_STEP && file )
{
debug_file = file;
debug_line = line;
debug_frame = frame;
debug_end_stepping();
}
else if ( ( breakpoint_id = handle_function_breakpoint( name ) ) ||
( breakpoint_id = handle_line_breakpoint( file, line ) ) )
{
debug_file = file;
debug_line = line;
debug_frame = frame;
debug_on_breakpoint( breakpoint_id );
}
}
void debug_on_exit_function( OBJECT * name )
{
assert( debug_is_debugging() );
--debug_depth;
if ( debug_depth < 0 )
{
/* The current location is no longer valid
after we return from the containing function. */
debug_file = NULL;
debug_line = 0;
}
}
#if NT
static HANDLE child_handle;
static DWORD child_pid;
#else
static int child_pid;
#endif
static void debug_child_continue( int argc, const char * * argv )
{
debug_state = DEBUG_RUN;
debug_depth = 0;
}
static void debug_child_step( int argc, const char * * argv )
{
debug_state = DEBUG_STEP;
debug_depth = 0;
}
static void debug_child_next( int argc, const char * * argv )
{
debug_state = DEBUG_NEXT;
debug_depth = 0;
}
static void debug_child_finish( int argc, const char * * argv )
{
debug_state = DEBUG_FINISH;
debug_depth = 0;
}
static void debug_child_kill( int argc, const char * * argv )
{
b2::clean_exit( 0 );
}
static int debug_add_breakpoint( const char * name )
{
const char * file_ptr = name;
const char * ptr = strrchr( file_ptr, ':' );
if ( ptr )
{
char * end;
long line = strtoul( ptr + 1, &end, 10 );
if ( line > 0 && line <= INT_MAX && end != ptr + 1 && *end == 0 )
{
OBJECT * file = object_new_range( file_ptr, int32_t(ptr - file_ptr) );
return add_line_breakpoint( file, line );
}
else
{
OBJECT * name = object_new( file_ptr );
return add_function_breakpoint( name );
}
}
else
{
OBJECT * name = object_new( file_ptr );
return add_function_breakpoint( name );
}
}
static void debug_child_break( int argc, const char * * argv )
{
if ( argc == 2 )
{
debug_add_breakpoint( argv[ 1 ] );
}
}
static int get_breakpoint_by_name( const char * name )
{
int result;
const char * file_ptr = name;
const char * ptr = strrchr( file_ptr, ':' );
if ( ptr )
{
char * end;
long line = strtoul( ptr + 1, &end, 10 );
if ( line > 0 && line <= INT_MAX && end != ptr + 1 && *end == 0 )
{
OBJECT * file = object_new_range( file_ptr, int32_t(ptr - file_ptr) );
result = handle_line_breakpoint( file, line );
object_free( file );
}
else
{
OBJECT * name = object_new( file_ptr );
result = handle_function_breakpoint( name );
object_free( name );
}
}
else
{
OBJECT * name = object_new( file_ptr );
result = handle_function_breakpoint( name );
object_free( name );
}
return result;
}
static void debug_child_disable( int argc, const char * * argv )
{
if ( argc == 2 )
{
int id = atoi( argv[ 1 ] );
if ( id < 1 || id > num_breakpoints )
return;
--id;
if ( breakpoints[ id ].status == BREAKPOINT_DELETED )
return;
breakpoints[ id ].status = BREAKPOINT_DISABLED;
}
}
static void debug_child_enable( int argc, const char * * argv )
{
if ( argc == 2 )
{
int id = atoi( argv[ 1 ] );
if ( id < 1 || id > num_breakpoints )
return;
--id;
if ( breakpoints[ id ].status == BREAKPOINT_DELETED )
return;
breakpoints[ id ].status = BREAKPOINT_ENABLED;
}
}
static void debug_child_delete( int argc, const char * * argv )
{
if ( argc == 2 )
{
int id = atoi( argv[ 1 ] );
if ( id < 1 || id > num_breakpoints )
return;
--id;
breakpoints[ id ].status = BREAKPOINT_DELETED;
}
}
static void debug_child_print( int argc, const char * * argv )
{
FRAME * saved_frame;
OBJECT * saved_file;
int saved_line;
string buf[ 1 ];
const char * lines[ 2 ];
int i;
FRAME new_frame = *debug_frame;
/* Save the current file/line, since running parse_string
* will likely change it.
*/
saved_frame = debug_frame;
saved_file = debug_file;
saved_line = debug_line;
string_new( buf );
string_append( buf, "__DEBUG_PRINT_HELPER__" );
for ( i = 1; i < argc; ++i )
{
string_push_back( buf, ' ' );
string_append( buf, argv[ i ] );
}
string_append( buf, " ;\n" );
lines[ 0 ] = buf->value;
lines[ 1 ] = NULL;
parse_string( constant_builtin, lines, &new_frame );
string_free( buf );
debug_list_write( command_output, *debug_print_result );
fflush( command_output );
debug_frame = saved_frame;
debug_file = saved_file;
debug_line = saved_line;
}
static void debug_child_frame( int argc, const char * * argv )
{
if ( argc == 2 )
{
debug_selected_frame_number = atoi( argv[ 1 ] );
}
else
{
assert( !"Wrong number of arguments to frame." );
}
}
static void debug_child_info( int argc, const char * * argv )
{
if ( strcmp( argv[ 1 ], "locals" ) == 0 )
{
LIST * locals = L0;
if ( debug_frame->function )
{
locals = function_get_variables( (FUNCTION*)debug_frame->function );
}
debug_list_write( command_output, locals );
fflush( command_output );
list_free( locals );
}
else if ( strcmp( argv[ 1 ], "frame" ) == 0 )
{
int frame_number = debug_selected_frame_number;
int i;
FRAME base = *debug_frame;
FRAME * frame = &base;
base.file = debug_file;
base.line = debug_line;
if ( argc == 3 ) frame_number = atoi( argv[ 2 ] );
for ( i = 0; i < frame_number; ++i ) frame = frame->prev;
debug_frame_write( command_output, frame );
}
else if ( strcmp( argv[ 1 ], "depth" ) == 0 )
{
int result = 0;
FRAME * frame = debug_frame;
while ( frame )
{
frame = frame->prev;
++result;
}
fprintf( command_output, "%d", result );
fputc( '\0', command_output );
fflush( command_output );
}
}
/* Commands for the parent. */
#ifdef NT
static int get_module_filename( string * out )
{
DWORD result;
string_reserve( out, 256 + 1 );
string_truncate( out, 256 );
while( ( result = GetModuleFileNameA( NULL, out->value, DWORD(out->size) ) ) == DWORD(out->size) )
{
string_reserve( out, out->size * 2 + 1);
string_truncate( out, out->size * 2 );
}
if ( result != 0 )
{
string_truncate( out, result );
return 1;
}
else
{
return 0;
}
}
#endif
static struct command_elem child_commands[] =
{
{ "continue", &debug_child_continue },
{ "kill", &debug_child_kill },
{ "step", &debug_child_step },
{ "next", &debug_child_next },
{ "finish", &debug_child_finish },
{ "break", &debug_child_break },
{ "disable", &debug_child_disable },
{ "enable", &debug_child_enable },
{ "delete", &debug_child_delete },
{ "print", &debug_child_print },
{ "frame", &debug_child_frame },
{ "info", &debug_child_info },
{ NULL, NULL }
};
static void debug_mi_error( const char * message )
{
debug_mi_format_token();
printf( "^error,msg=\"%s\"\n(gdb) \n", message );
}
static void debug_error_( const char * message )
{
if ( globs.debug_interface == DEBUG_INTERFACE_CONSOLE )
{
printf( "%s\n", message );
}
else if ( globs.debug_interface == DEBUG_INTERFACE_MI )
{
debug_mi_error( message );
}
}
static const char * debug_format_message( const char * format, va_list vargs )
{
char * buf;
int result;
int sz = 80;
for ( ; ; )
{
va_list args;
buf = (char *)malloc( sz );
if ( !buf )
return 0;
#ifndef va_copy
args = vargs;
#else
va_copy( args, vargs );
#endif
#if defined(_MSC_VER) && (_MSC_VER <= 1310)
result = _vsnprintf( buf, sz, format, args );
#else
result = vsnprintf( buf, sz, format, args );
#endif
va_end( args );
if ( 0 <= result && result < sz )
return buf;
free( buf );
if ( result < 0 )
return 0;
sz = result + 1;
}
}
static void debug_error( const char * format, ... )
{
va_list args;
const char * msg;
va_start( args, format );
msg = debug_format_message( format, args );
va_end( args );
if ( !msg )
{
debug_error_( "Failed formatting error message." );
return;
}
debug_error_( msg );
free( ( void * )msg );
}
static void debug_parent_child_exited( int pid, int exit_code )
{
if ( globs.debug_interface == DEBUG_INTERFACE_CONSOLE )
{
printf( "Child %d exited with status %d\n", (int)child_pid, (int)exit_code );
}
else if ( globs.debug_interface == DEBUG_INTERFACE_MI )
{
if ( exit_code == 0 )
printf( "*stopped,reason=\"exited-normally\"\n(gdb) \n" );
else
printf( "*stopped,reason=\"exited\",exit-code=\"%d\"\n(gdb) \n", exit_code );
}
else
{
assert( !"Wrong value of debug_interface." );
}
}
#if !NT
static void debug_parent_child_signalled( int pid, int id )
{
if ( globs.debug_interface == DEBUG_INTERFACE_CONSOLE )
{
printf( "Child %d exited on signal %d\n", child_pid, id );
}
else if ( globs.debug_interface == DEBUG_INTERFACE_MI )
{
const char * name = "unknown";
const char * meaning = "unknown";
switch( id )
{
case SIGINT: name = "SIGINT"; meaning = "Interrupt"; break;
}
printf("*stopped,reason=\"exited-signalled\",signal-name=\"%s\",signal-meaning=\"%s\"\n(gdb) \n", name, meaning);
}
else
{
assert( !"Wrong value of debug_interface." );
}
}
#endif
static void debug_parent_on_breakpoint( void )
{
FRAME_INFO base;
int id;
id = debug_int_read( command_child );
fprintf( command_output, "info frame\n" );
fflush( command_output );
debug_frame_read( command_child, &base );
if ( globs.debug_interface == DEBUG_INTERFACE_CONSOLE )
{
printf( "Breakpoint %d, ", id );
debug_print_frame_info( base );
printf( "\n" );
debug_print_source( base.file, base.line );
}
else if ( globs.debug_interface == DEBUG_INTERFACE_MI )
{
printf( "*stopped,reason=\"breakpoint-hit\",bkptno=\"%d\",disp=\"keep\",", id );
debug_mi_print_frame_info( &base );
printf( ",thread-id=\"1\",stopped-threads=\"all\"" );
printf( "\n(gdb) \n" );
}
else
{
assert( !"Wrong value if debug_interface" );
}
fflush( stdout );
}
static void debug_parent_on_end_stepping( void )
{
FRAME_INFO base;
fprintf( command_output, "info frame\n" );
fflush( command_output );
debug_frame_read( command_child, &base );
if ( globs.debug_interface == DEBUG_INTERFACE_CONSOLE )
{
debug_print_source( base.file, base.line );
}
else
{
printf( "*stopped,reason=\"end-stepping-range\"," );
debug_mi_print_frame_info( &base );
printf( ",thread-id=\"1\"" );
printf( "\n(gdb) \n" );
}
fflush( stdout );
}
/* Waits for events from the child. */
static void debug_parent_wait( int print_message )
{
int ch = fgetc( command_child );
if ( ch == DEBUG_MSG_BREAKPOINT )
{
debug_parent_on_breakpoint();
}
else if ( ch == DEBUG_MSG_END_STEPPING )
{
debug_parent_on_end_stepping();
}
else if ( ch == DEBUG_MSG_SETUP )
{